Keira Knightley has hit back at rumors she's had cosmetic surgery to plump up her lips, insisting her trademark pout is all her own. Allegations the star had received collagen injections were sparked last year when photos of her sporting a fuller mouth appeared in magazines across the world.

And Knightley reveals she's been besieged by angry fan mail ever since - first for supposedly having the treatment, and then for not admitting it.

She says, "You get letters saying, 'I can't believe you're condoning this,' and then you deny having them done and you get told off for lying. You just can't win."

Check out Keira HERE.

(This news article provided by World Entertainment News Network)